Ruptured popliteal cyst and pyogenic arthritis.
D000368:Aged; D001170:Arthritis, Infectious / Q000150:complications*; D004927:Escherichia coli Infections / Q000150:complications*; D005260:Female; D006801:Humans; D007717:Knee; D012422:Rupture, Spontaneous; D013203:Staphylococcal Infections / Q000150:complications*; D013581:Synovial Cyst / Q000209:etiology*